Mode-hopping mechanism generating colored noise in a magnetic tunnel junction based spin torque oscillator

Sharma, Raghav; Dürrenfeld, P.; Iacocca, E.; Heinonen, O. G.; Åkerman, J.; Muduli, P. K.

doi:10.1063/1.4896634

Title: Mode-hopping mechanism generating colored noise in a magnetic tunnel junction based spin torque oscillator

Journal Article · Mon Sep 29 00:00:00 EDT 2014 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4896634· OSTI ID:1357043

Sharma, Raghav ^[1]; Dürrenfeld, P. ^[2]; Iacocca, E. ^[2]; Heinonen, O. G. ^[3]; Åkerman, J. ^[4]; Muduli, P. K. ^[5]

Indian Inst. of Technology (IIT), New Delhi (India)
Univ. of Gothenburg (Sweden). Dept. of Physics
Argonne National Lab. (ANL), Argonne, IL (United States). Materials Science Division
Univ. of Gothenburg (Sweden). Dept. of Physics; KTH Royal Inst. of Technology, Kista (Sweden). School of Information and Communication Technology (ICT)
Indian Inst. of Technology (IIT), New Delhi (India); Univ. of Gothenburg (Sweden). Dept. of Physics

The frequency noise spectrum of a magnetic tunnel junction (MTJ) based spin torque oscillator (STO) is examined where multiple modes and mode-hopping events are observed. The frequency noise spectrum is found to consist of both white noise and 1/f frequency noise. Here, we find a systematic and similar dependence of both white noise and 1/f frequency noise on bias current and the relative angle between the reference and free layers, which changes the effective damping and hence the mode-hopping behavior in this system. The frequency at which the 1/f frequency noise changes to white noise increases as the free layer is aligned away from the anti-parallel orientation w.r.t the reference layer. Lastly, these results indicate that the origin of 1/f frequency noise is related to mode-hopping which produces both white noise as well as 1/f frequency noise similar to the case of ring lasers.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: Swedish Foundation for Strategic Research (SSF); Swedish Research Council (VR); USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1357043

Journal Information:: Applied Physics Letters, Vol. 105, Issue 13; ISSN 0003-6951

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 16 works

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Auto-oscillating Spin-Wave Modes of Constriction-Based Spin Hall Nano-oscillators in Weak In-Plane Fields Mazraati, Hamid; Etesami, Seyyed Ruhollah; Banuazizi, Seyed Amir Hossein Physical Review Applied, Vol. 10, Issue 5 https://doi.org/10.1103/physrevapplied.10.054017	journal	November 2018
Dynamical Mode Coupling and Coherence in a Spin Hall Nano-Oscillator with Perpendicular Magnetic Anisotropy Chen, Lina; Urazhdin, S.; Du, Y. W. Physical Review Applied, Vol. 11, Issue 6 https://doi.org/10.1103/physrevapplied.11.064038	journal	June 2019
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Spin-Torque and Spin-Hall Nano-Oscillators Chen, Tingsu; Dumas, Randy K.; Eklund, Anders arXiv https://doi.org/10.48550/arxiv.1512.03162	preprint	January 2015
Injection locking of multiple auto-oscillation modes in a tapered nanowire spin Hall oscillator Wagner, Kai; Smith, Andrew; Hache, Toni arXiv https://doi.org/10.48550/arxiv.1809.06291	preprint	January 2018

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